Noise reduction in the centroiding of laser guide star spot pattern using thresholded Zernike reconstructor

Akondi Vyas; M. B. Roopashree; B. Raghavendra Prasad

doi:10.1117/12.856640

28 July 2010 Noise reduction in the centroiding of laser guide star spot pattern using thresholded Zernike reconstructor

Akondi Vyas, M. B. Roopashree, B. Raghavendra Prasad

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 77364E (2010) https://doi.org/10.1117/12.856640
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Centroiding inaccuracies contribute to most of the wavefront reconstruction error in a Shack Hartmann sensor based adaptive optics system. These errors primarily occur due to the presence of photon noise, readout noise, finite background and strong scintillations. Elongation of the spots in the case of large apertures while using Laser guide star as reference makes the situation further worse. A denoising procedure based on thresholded Zernike reconstructor and pattern matching is suggested in this paper to largely overcome these problems. Individual spot pattern images are reconstructed using Zernike polynomials and matched with ideal spot pattern without distortion to arrive at accurate local centroid positions.

Citation Download Citation

Akondi Vyas, M. B. Roopashree, and B. Raghavendra Prasad "Noise reduction in the centroiding of laser guide star spot pattern using thresholded Zernike reconstructor", Proc. SPIE 7736, Adaptive Optics Systems II, 77364E (28 July 2010); https://doi.org/10.1117/12.856640

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available